When forwarding the throttles the throttle indicator advances as seen on the EICAS but engine thrust is not responding, it only responds when thrust reverses are deployed momentarily.
Could anyone please help me with this issue.

Thank you for your help I have done the calibration as you have indicated.
The engine revs up when moving the throttle only after the retro lever is moved and works fine but the minute I move the throttle back to idle it stops responding.